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staging: rtl8192u: remove redundant assignment to pointer crypt
[linux/fpc-iii.git] / drivers / char / ipmi / ipmi_ssif.c
blob305fa5054274f5bb352545b43289cd0a6625be4b
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * ipmi_ssif.c
4 *
5 * The interface to the IPMI driver for SMBus access to a SMBus
6 * compliant device. Called SSIF by the IPMI spec.
7 *
8 * Author: Intel Corporation
9 * Todd Davis <todd.c.davis@intel.com>
10 *
11 * Rewritten by Corey Minyard <minyard@acm.org> to support the
12 * non-blocking I2C interface, add support for multi-part
13 * transactions, add PEC support, and general clenaup.
14 *
15 * Copyright 2003 Intel Corporation
16 * Copyright 2005 MontaVista Software
17 */
18
19 /*
20 * This file holds the "policy" for the interface to the SSIF state
21 * machine. It does the configuration, handles timers and interrupts,
22 * and drives the real SSIF state machine.
23 */
24
25 /*
26 * TODO: Figure out how to use SMB alerts. This will require a new
27 * interface into the I2C driver, I believe.
28 */
29
30 #define pr_fmt(fmt) "ipmi_ssif: " fmt
31 #define dev_fmt(fmt) "ipmi_ssif: " fmt
32
33 #if defined(MODVERSIONS)
34 #include <linux/modversions.h>
35 #endif
36
37 #include <linux/module.h>
38 #include <linux/moduleparam.h>
39 #include <linux/sched.h>
40 #include <linux/seq_file.h>
41 #include <linux/timer.h>
42 #include <linux/delay.h>
43 #include <linux/errno.h>
44 #include <linux/spinlock.h>
45 #include <linux/slab.h>
46 #include <linux/list.h>
47 #include <linux/i2c.h>
48 #include <linux/ipmi_smi.h>
49 #include <linux/init.h>
50 #include <linux/dmi.h>
51 #include <linux/kthread.h>
52 #include <linux/acpi.h>
53 #include <linux/ctype.h>
54 #include <linux/time64.h>
55 #include "ipmi_si_sm.h"
56 #include "ipmi_dmi.h"
57
58 #define DEVICE_NAME "ipmi_ssif"
59
60 #define IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD 0x57
61
62 #define SSIF_IPMI_REQUEST 2
63 #define SSIF_IPMI_MULTI_PART_REQUEST_START 6
64 #define SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE 7
65 #define SSIF_IPMI_MULTI_PART_REQUEST_END 8
66 #define SSIF_IPMI_RESPONSE 3
67 #define SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE 9
68
69 /* ssif_debug is a bit-field
70 * SSIF_DEBUG_MSG - commands and their responses
71 * SSIF_DEBUG_STATES - message states
72 * SSIF_DEBUG_TIMING - Measure times between events in the driver
73 */
74 #define SSIF_DEBUG_TIMING 4
75 #define SSIF_DEBUG_STATE 2
76 #define SSIF_DEBUG_MSG 1
77 #define SSIF_NODEBUG 0
78 #define SSIF_DEFAULT_DEBUG (SSIF_NODEBUG)
79
80 /*
81 * Timer values
82 */
83 #define SSIF_MSG_USEC 20000 /* 20ms between message tries. */
84 #define SSIF_MSG_PART_USEC 5000 /* 5ms for a message part */
85
86 /* How many times to we retry sending/receiving the message. */
87 #define SSIF_SEND_RETRIES 5
88 #define SSIF_RECV_RETRIES 250
89
90 #define SSIF_MSG_MSEC (SSIF_MSG_USEC / 1000)
91 #define SSIF_MSG_JIFFIES ((SSIF_MSG_USEC * 1000) / TICK_NSEC)
92 #define SSIF_MSG_PART_JIFFIES ((SSIF_MSG_PART_USEC * 1000) / TICK_NSEC)
93
94 /*
95 * Timeout for the watch, only used for get flag timer.
96 */
97 #define SSIF_WATCH_MSG_TIMEOUT msecs_to_jiffies(10)
98 #define SSIF_WATCH_WATCHDOG_TIMEOUT msecs_to_jiffies(250)
99
100 enum ssif_intf_state {
101 SSIF_NORMAL,
102 SSIF_GETTING_FLAGS,
103 SSIF_GETTING_EVENTS,
104 SSIF_CLEARING_FLAGS,
105 SSIF_GETTING_MESSAGES,
106 /* FIXME - add watchdog stuff. */
107 };
108
109 #define SSIF_IDLE(ssif) ((ssif)->ssif_state == SSIF_NORMAL \
110 && (ssif)->curr_msg == NULL)
111
112 /*
113 * Indexes into stats[] in ssif_info below.
114 */
115 enum ssif_stat_indexes {
116 /* Number of total messages sent. */
117 SSIF_STAT_sent_messages = 0,
118
119 /*
120 * Number of message parts sent. Messages may be broken into
121 * parts if they are long.
122 */
123 SSIF_STAT_sent_messages_parts,
124
125 /*
126 * Number of time a message was retried.
127 */
128 SSIF_STAT_send_retries,
129
130 /*
131 * Number of times the send of a message failed.
132 */
133 SSIF_STAT_send_errors,
134
135 /*
136 * Number of message responses received.
137 */
138 SSIF_STAT_received_messages,
139
140 /*
141 * Number of message fragments received.
142 */
143 SSIF_STAT_received_message_parts,
144
145 /*
146 * Number of times the receive of a message was retried.
147 */
148 SSIF_STAT_receive_retries,
149
150 /*
151 * Number of errors receiving messages.
152 */
153 SSIF_STAT_receive_errors,
154
155 /*
156 * Number of times a flag fetch was requested.
157 */
158 SSIF_STAT_flag_fetches,
159
160 /*
161 * Number of times the hardware didn't follow the state machine.
162 */
163 SSIF_STAT_hosed,
164
165 /*
166 * Number of received events.
167 */
168 SSIF_STAT_events,
169
170 /* Number of asyncronous messages received. */
171 SSIF_STAT_incoming_messages,
172
173 /* Number of watchdog pretimeouts. */
174 SSIF_STAT_watchdog_pretimeouts,
175
176 /* Number of alers received. */
177 SSIF_STAT_alerts,
178
179 /* Always add statistics before this value, it must be last. */
180 SSIF_NUM_STATS
181 };
182
183 struct ssif_addr_info {
184 struct i2c_board_info binfo;
185 char *adapter_name;
186 int debug;
187 int slave_addr;
188 enum ipmi_addr_src addr_src;
189 union ipmi_smi_info_union addr_info;
190 struct device *dev;
191 struct i2c_client *client;
192
193 struct i2c_client *added_client;
194
195 struct mutex clients_mutex;
196 struct list_head clients;
197
198 struct list_head link;
199 };
200
201 struct ssif_info;
202
203 typedef void (*ssif_i2c_done)(struct ssif_info *ssif_info, int result,
204 unsigned char *data, unsigned int len);
205
206 struct ssif_info {
207 struct ipmi_smi *intf;
208 spinlock_t lock;
209 struct ipmi_smi_msg *waiting_msg;
210 struct ipmi_smi_msg *curr_msg;
211 enum ssif_intf_state ssif_state;
212 unsigned long ssif_debug;
213
214 struct ipmi_smi_handlers handlers;
215
216 enum ipmi_addr_src addr_source; /* ACPI, PCI, SMBIOS, hardcode, etc. */
217 union ipmi_smi_info_union addr_info;
218
219 /*
220 * Flags from the last GET_MSG_FLAGS command, used when an ATTN
221 * is set to hold the flags until we are done handling everything
222 * from the flags.
223 */
224 #define RECEIVE_MSG_AVAIL 0x01
225 #define EVENT_MSG_BUFFER_FULL 0x02
226 #define WDT_PRE_TIMEOUT_INT 0x08
227 unsigned char msg_flags;
228
229 u8 global_enables;
230 bool has_event_buffer;
231 bool supports_alert;
232
233 /*
234 * Used to tell what we should do with alerts. If we are
235 * waiting on a response, read the data immediately.
236 */
237 bool got_alert;
238 bool waiting_alert;
239
240 /*
241 * If set to true, this will request events the next time the
242 * state machine is idle.
243 */
244 bool req_events;
245
246 /*
247 * If set to true, this will request flags the next time the
248 * state machine is idle.
249 */
250 bool req_flags;
251
252 /*
253 * Used to perform timer operations when run-to-completion
254 * mode is on. This is a countdown timer.
255 */
256 int rtc_us_timer;
257
258 /* Used for sending/receiving data. +1 for the length. */
259 unsigned char data[IPMI_MAX_MSG_LENGTH + 1];
260 unsigned int data_len;
261
262 /* Temp receive buffer, gets copied into data. */
263 unsigned char recv[I2C_SMBUS_BLOCK_MAX];
264
265 struct i2c_client *client;
266 ssif_i2c_done done_handler;
267
268 /* Thread interface handling */
269 struct task_struct *thread;
270 struct completion wake_thread;
271 bool stopping;
272 int i2c_read_write;
273 int i2c_command;
274 unsigned char *i2c_data;
275 unsigned int i2c_size;
276
277 struct timer_list retry_timer;
278 int retries_left;
279
280 long watch_timeout; /* Timeout for flags check, 0 if off. */
281 struct timer_list watch_timer; /* Flag fetch timer. */
282
283 /* Info from SSIF cmd */
284 unsigned char max_xmit_msg_size;
285 unsigned char max_recv_msg_size;
286 bool cmd8_works; /* See test_multipart_messages() for details. */
287 unsigned int multi_support;
288 int supports_pec;
289
290 #define SSIF_NO_MULTI 0
291 #define SSIF_MULTI_2_PART 1
292 #define SSIF_MULTI_n_PART 2
293 unsigned char *multi_data;
294 unsigned int multi_len;
295 unsigned int multi_pos;
296
297 atomic_t stats[SSIF_NUM_STATS];
298 };
299
300 #define ssif_inc_stat(ssif, stat) \
301 atomic_inc(&(ssif)->stats[SSIF_STAT_ ## stat])
302 #define ssif_get_stat(ssif, stat) \
303 ((unsigned int) atomic_read(&(ssif)->stats[SSIF_STAT_ ## stat]))
304
305 static bool initialized;
306 static bool platform_registered;
307
308 static void return_hosed_msg(struct ssif_info *ssif_info,
309 struct ipmi_smi_msg *msg);
310 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags);
311 static int start_send(struct ssif_info *ssif_info,
312 unsigned char *data,
313 unsigned int len);
314
315 static unsigned long *ipmi_ssif_lock_cond(struct ssif_info *ssif_info,
316 unsigned long *flags)
317 {
318 spin_lock_irqsave(&ssif_info->lock, *flags);
319 return flags;
320 }
321
322 static void ipmi_ssif_unlock_cond(struct ssif_info *ssif_info,
323 unsigned long *flags)
324 {
325 spin_unlock_irqrestore(&ssif_info->lock, *flags);
326 }
327
328 static void deliver_recv_msg(struct ssif_info *ssif_info,
329 struct ipmi_smi_msg *msg)
330 {
331 if (msg->rsp_size < 0) {
332 return_hosed_msg(ssif_info, msg);
333 dev_err(&ssif_info->client->dev,
334 "%s: Malformed message: rsp_size = %d\n",
335 __func__, msg->rsp_size);
336 } else {
337 ipmi_smi_msg_received(ssif_info->intf, msg);
338 }
339 }
340
341 static void return_hosed_msg(struct ssif_info *ssif_info,
342 struct ipmi_smi_msg *msg)
343 {
344 ssif_inc_stat(ssif_info, hosed);
345
346 /* Make it a response */
347 msg->rsp[0] = msg->data[0] | 4;
348 msg->rsp[1] = msg->data[1];
349 msg->rsp[2] = 0xFF; /* Unknown error. */
350 msg->rsp_size = 3;
351
352 deliver_recv_msg(ssif_info, msg);
353 }
354
355 /*
356 * Must be called with the message lock held. This will release the
357 * message lock. Note that the caller will check SSIF_IDLE and start a
358 * new operation, so there is no need to check for new messages to
359 * start in here.
360 */
361 static void start_clear_flags(struct ssif_info *ssif_info, unsigned long *flags)
362 {
363 unsigned char msg[3];
364
365 ssif_info->msg_flags &= ~WDT_PRE_TIMEOUT_INT;
366 ssif_info->ssif_state = SSIF_CLEARING_FLAGS;
367 ipmi_ssif_unlock_cond(ssif_info, flags);
368
369 /* Make sure the watchdog pre-timeout flag is not set at startup. */
370 msg[0] = (IPMI_NETFN_APP_REQUEST << 2);
371 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
372 msg[2] = WDT_PRE_TIMEOUT_INT;
373
374 if (start_send(ssif_info, msg, 3) != 0) {
375 /* Error, just go to normal state. */
376 ssif_info->ssif_state = SSIF_NORMAL;
377 }
378 }
379
380 static void start_flag_fetch(struct ssif_info *ssif_info, unsigned long *flags)
381 {
382 unsigned char mb[2];
383
384 ssif_info->req_flags = false;
385 ssif_info->ssif_state = SSIF_GETTING_FLAGS;
386 ipmi_ssif_unlock_cond(ssif_info, flags);
387
388 mb[0] = (IPMI_NETFN_APP_REQUEST << 2);
389 mb[1] = IPMI_GET_MSG_FLAGS_CMD;
390 if (start_send(ssif_info, mb, 2) != 0)
391 ssif_info->ssif_state = SSIF_NORMAL;
392 }
393
394 static void check_start_send(struct ssif_info *ssif_info, unsigned long *flags,
395 struct ipmi_smi_msg *msg)
396 {
397 if (start_send(ssif_info, msg->data, msg->data_size) != 0) {
398 unsigned long oflags;
399
400 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
401 ssif_info->curr_msg = NULL;
402 ssif_info->ssif_state = SSIF_NORMAL;
403 ipmi_ssif_unlock_cond(ssif_info, flags);
404 ipmi_free_smi_msg(msg);
405 }
406 }
407
408 static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
409 {
410 struct ipmi_smi_msg *msg;
411
412 ssif_info->req_events = false;
413
414 msg = ipmi_alloc_smi_msg();
415 if (!msg) {
416 ssif_info->ssif_state = SSIF_NORMAL;
417 ipmi_ssif_unlock_cond(ssif_info, flags);
418 return;
419 }
420
421 ssif_info->curr_msg = msg;
422 ssif_info->ssif_state = SSIF_GETTING_EVENTS;
423 ipmi_ssif_unlock_cond(ssif_info, flags);
424
425 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
426 msg->data[1] = IPMI_READ_EVENT_MSG_BUFFER_CMD;
427 msg->data_size = 2;
428
429 check_start_send(ssif_info, flags, msg);
430 }
431
432 static void start_recv_msg_fetch(struct ssif_info *ssif_info,
433 unsigned long *flags)
434 {
435 struct ipmi_smi_msg *msg;
436
437 msg = ipmi_alloc_smi_msg();
438 if (!msg) {
439 ssif_info->ssif_state = SSIF_NORMAL;
440 ipmi_ssif_unlock_cond(ssif_info, flags);
441 return;
442 }
443
444 ssif_info->curr_msg = msg;
445 ssif_info->ssif_state = SSIF_GETTING_MESSAGES;
446 ipmi_ssif_unlock_cond(ssif_info, flags);
447
448 msg->data[0] = (IPMI_NETFN_APP_REQUEST << 2);
449 msg->data[1] = IPMI_GET_MSG_CMD;
450 msg->data_size = 2;
451
452 check_start_send(ssif_info, flags, msg);
453 }
454
455 /*
456 * Must be called with the message lock held. This will release the
457 * message lock. Note that the caller will check SSIF_IDLE and start a
458 * new operation, so there is no need to check for new messages to
459 * start in here.
460 */
461 static void handle_flags(struct ssif_info *ssif_info, unsigned long *flags)
462 {
463 if (ssif_info->msg_flags & WDT_PRE_TIMEOUT_INT) {
464 /* Watchdog pre-timeout */
465 ssif_inc_stat(ssif_info, watchdog_pretimeouts);
466 start_clear_flags(ssif_info, flags);
467 ipmi_smi_watchdog_pretimeout(ssif_info->intf);
468 } else if (ssif_info->msg_flags & RECEIVE_MSG_AVAIL)
469 /* Messages available. */
470 start_recv_msg_fetch(ssif_info, flags);
471 else if (ssif_info->msg_flags & EVENT_MSG_BUFFER_FULL)
472 /* Events available. */
473 start_event_fetch(ssif_info, flags);
474 else {
475 ssif_info->ssif_state = SSIF_NORMAL;
476 ipmi_ssif_unlock_cond(ssif_info, flags);
477 }
478 }
479
480 static int ipmi_ssif_thread(void *data)
481 {
482 struct ssif_info *ssif_info = data;
483
484 while (!kthread_should_stop()) {
485 int result;
486
487 /* Wait for something to do */
488 result = wait_for_completion_interruptible(
489 &ssif_info->wake_thread);
490 if (ssif_info->stopping)
491 break;
492 if (result == -ERESTARTSYS)
493 continue;
494 init_completion(&ssif_info->wake_thread);
495
496 if (ssif_info->i2c_read_write == I2C_SMBUS_WRITE) {
497 result = i2c_smbus_write_block_data(
498 ssif_info->client, ssif_info->i2c_command,
499 ssif_info->i2c_data[0],
500 ssif_info->i2c_data + 1);
501 ssif_info->done_handler(ssif_info, result, NULL, 0);
502 } else {
503 result = i2c_smbus_read_block_data(
504 ssif_info->client, ssif_info->i2c_command,
505 ssif_info->i2c_data);
506 if (result < 0)
507 ssif_info->done_handler(ssif_info, result,
508 NULL, 0);
509 else
510 ssif_info->done_handler(ssif_info, 0,
511 ssif_info->i2c_data,
512 result);
513 }
514 }
515
516 return 0;
517 }
518
519 static int ssif_i2c_send(struct ssif_info *ssif_info,
520 ssif_i2c_done handler,
521 int read_write, int command,
522 unsigned char *data, unsigned int size)
523 {
524 ssif_info->done_handler = handler;
525
526 ssif_info->i2c_read_write = read_write;
527 ssif_info->i2c_command = command;
528 ssif_info->i2c_data = data;
529 ssif_info->i2c_size = size;
530 complete(&ssif_info->wake_thread);
531 return 0;
532 }
533
534
535 static void msg_done_handler(struct ssif_info *ssif_info, int result,
536 unsigned char *data, unsigned int len);
537
538 static void start_get(struct ssif_info *ssif_info)
539 {
540 int rv;
541
542 ssif_info->rtc_us_timer = 0;
543 ssif_info->multi_pos = 0;
544
545 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
546 SSIF_IPMI_RESPONSE,
547 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
548 if (rv < 0) {
549 /* request failed, just return the error. */
550 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
551 dev_dbg(&ssif_info->client->dev,
552 "Error from i2c_non_blocking_op(5)\n");
553
554 msg_done_handler(ssif_info, -EIO, NULL, 0);
555 }
556 }
557
558 static void retry_timeout(struct timer_list *t)
559 {
560 struct ssif_info *ssif_info = from_timer(ssif_info, t, retry_timer);
561 unsigned long oflags, *flags;
562 bool waiting;
563
564 if (ssif_info->stopping)
565 return;
566
567 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
568 waiting = ssif_info->waiting_alert;
569 ssif_info->waiting_alert = false;
570 ipmi_ssif_unlock_cond(ssif_info, flags);
571
572 if (waiting)
573 start_get(ssif_info);
574 }
575
576 static void watch_timeout(struct timer_list *t)
577 {
578 struct ssif_info *ssif_info = from_timer(ssif_info, t, watch_timer);
579 unsigned long oflags, *flags;
580
581 if (ssif_info->stopping)
582 return;
583
584 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
585 if (ssif_info->watch_timeout) {
586 mod_timer(&ssif_info->watch_timer,
587 jiffies + ssif_info->watch_timeout);
588 if (SSIF_IDLE(ssif_info)) {
589 start_flag_fetch(ssif_info, flags); /* Releases lock */
590 return;
591 }
592 ssif_info->req_flags = true;
593 }
594 ipmi_ssif_unlock_cond(ssif_info, flags);
595 }
596
597 static void ssif_alert(struct i2c_client *client, enum i2c_alert_protocol type,
598 unsigned int data)
599 {
600 struct ssif_info *ssif_info = i2c_get_clientdata(client);
601 unsigned long oflags, *flags;
602 bool do_get = false;
603
604 if (type != I2C_PROTOCOL_SMBUS_ALERT)
605 return;
606
607 ssif_inc_stat(ssif_info, alerts);
608
609 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
610 if (ssif_info->waiting_alert) {
611 ssif_info->waiting_alert = false;
612 del_timer(&ssif_info->retry_timer);
613 do_get = true;
614 } else if (ssif_info->curr_msg) {
615 ssif_info->got_alert = true;
616 }
617 ipmi_ssif_unlock_cond(ssif_info, flags);
618 if (do_get)
619 start_get(ssif_info);
620 }
621
622 static int start_resend(struct ssif_info *ssif_info);
623
624 static void msg_done_handler(struct ssif_info *ssif_info, int result,
625 unsigned char *data, unsigned int len)
626 {
627 struct ipmi_smi_msg *msg;
628 unsigned long oflags, *flags;
629 int rv;
630
631 /*
632 * We are single-threaded here, so no need for a lock until we
633 * start messing with driver states or the queues.
634 */
635
636 if (result < 0) {
637 ssif_info->retries_left--;
638 if (ssif_info->retries_left > 0) {
639 ssif_inc_stat(ssif_info, receive_retries);
640
641 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
642 ssif_info->waiting_alert = true;
643 ssif_info->rtc_us_timer = SSIF_MSG_USEC;
644 if (!ssif_info->stopping)
645 mod_timer(&ssif_info->retry_timer,
646 jiffies + SSIF_MSG_JIFFIES);
647 ipmi_ssif_unlock_cond(ssif_info, flags);
648 return;
649 }
650
651 ssif_inc_stat(ssif_info, receive_errors);
652
653 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
654 dev_dbg(&ssif_info->client->dev,
655 "%s: Error %d\n", __func__, result);
656 len = 0;
657 goto continue_op;
658 }
659
660 if ((len > 1) && (ssif_info->multi_pos == 0)
661 && (data[0] == 0x00) && (data[1] == 0x01)) {
662 /* Start of multi-part read. Start the next transaction. */
663 int i;
664
665 ssif_inc_stat(ssif_info, received_message_parts);
666
667 /* Remove the multi-part read marker. */
668 len -= 2;
669 data += 2;
670 for (i = 0; i < len; i++)
671 ssif_info->data[i] = data[i];
672 ssif_info->multi_len = len;
673 ssif_info->multi_pos = 1;
674
675 rv = ssif_i2c_send(ssif_info, msg_done_handler, I2C_SMBUS_READ,
676 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
677 ssif_info->recv, I2C_SMBUS_BLOCK_DATA);
678 if (rv < 0) {
679 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
680 dev_dbg(&ssif_info->client->dev,
681 "Error from i2c_non_blocking_op(1)\n");
682
683 result = -EIO;
684 } else
685 return;
686 } else if (ssif_info->multi_pos) {
687 /* Middle of multi-part read. Start the next transaction. */
688 int i;
689 unsigned char blocknum;
690
691 if (len == 0) {
692 result = -EIO;
693 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
694 dev_dbg(&ssif_info->client->dev,
695 "Middle message with no data\n");
696
697 goto continue_op;
698 }
699
700 blocknum = data[0];
701 len--;
702 data++;
703
704 if (blocknum != 0xff && len != 31) {
705 /* All blocks but the last must have 31 data bytes. */
706 result = -EIO;
707 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
708 dev_dbg(&ssif_info->client->dev,
709 "Received middle message <31\n");
710
711 goto continue_op;
712 }
713
714 if (ssif_info->multi_len + len > IPMI_MAX_MSG_LENGTH) {
715 /* Received message too big, abort the operation. */
716 result = -E2BIG;
717 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
718 dev_dbg(&ssif_info->client->dev,
719 "Received message too big\n");
720
721 goto continue_op;
722 }
723
724 for (i = 0; i < len; i++)
725 ssif_info->data[i + ssif_info->multi_len] = data[i];
726 ssif_info->multi_len += len;
727 if (blocknum == 0xff) {
728 /* End of read */
729 len = ssif_info->multi_len;
730 data = ssif_info->data;
731 } else if (blocknum + 1 != ssif_info->multi_pos) {
732 /*
733 * Out of sequence block, just abort. Block
734 * numbers start at zero for the second block,
735 * but multi_pos starts at one, so the +1.
736 */
737 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
738 dev_dbg(&ssif_info->client->dev,
739 "Received message out of sequence, expected %u, got %u\n",
740 ssif_info->multi_pos - 1, blocknum);
741 result = -EIO;
742 } else {
743 ssif_inc_stat(ssif_info, received_message_parts);
744
745 ssif_info->multi_pos++;
746
747 rv = ssif_i2c_send(ssif_info, msg_done_handler,
748 I2C_SMBUS_READ,
749 SSIF_IPMI_MULTI_PART_RESPONSE_MIDDLE,
750 ssif_info->recv,
751 I2C_SMBUS_BLOCK_DATA);
752 if (rv < 0) {
753 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
754 dev_dbg(&ssif_info->client->dev,
755 "Error from ssif_i2c_send\n");
756
757 result = -EIO;
758 } else
759 return;
760 }
761 }
762
763 continue_op:
764 if (result < 0) {
765 ssif_inc_stat(ssif_info, receive_errors);
766 } else {
767 ssif_inc_stat(ssif_info, received_messages);
768 ssif_inc_stat(ssif_info, received_message_parts);
769 }
770
771 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
772 dev_dbg(&ssif_info->client->dev,
773 "DONE 1: state = %d, result=%d\n",
774 ssif_info->ssif_state, result);
775
776 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
777 msg = ssif_info->curr_msg;
778 if (msg) {
779 msg->rsp_size = len;
780 if (msg->rsp_size > IPMI_MAX_MSG_LENGTH)
781 msg->rsp_size = IPMI_MAX_MSG_LENGTH;
782 memcpy(msg->rsp, data, msg->rsp_size);
783 ssif_info->curr_msg = NULL;
784 }
785
786 switch (ssif_info->ssif_state) {
787 case SSIF_NORMAL:
788 ipmi_ssif_unlock_cond(ssif_info, flags);
789 if (!msg)
790 break;
791
792 if (result < 0)
793 return_hosed_msg(ssif_info, msg);
794 else
795 deliver_recv_msg(ssif_info, msg);
796 break;
797
798 case SSIF_GETTING_FLAGS:
799 /* We got the flags from the SSIF, now handle them. */
800 if ((result < 0) || (len < 4) || (data[2] != 0)) {
801 /*
802 * Error fetching flags, or invalid length,
803 * just give up for now.
804 */
805 ssif_info->ssif_state = SSIF_NORMAL;
806 ipmi_ssif_unlock_cond(ssif_info, flags);
807 dev_warn(&ssif_info->client->dev,
808 "Error getting flags: %d %d, %x\n",
809 result, len, (len >= 3) ? data[2] : 0);
810 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
811 || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
812 /*
813 * Don't abort here, maybe it was a queued
814 * response to a previous command.
815 */
816 ipmi_ssif_unlock_cond(ssif_info, flags);
817 dev_warn(&ssif_info->client->dev,
818 "Invalid response getting flags: %x %x\n",
819 data[0], data[1]);
820 } else {
821 ssif_inc_stat(ssif_info, flag_fetches);
822 ssif_info->msg_flags = data[3];
823 handle_flags(ssif_info, flags);
824 }
825 break;
826
827 case SSIF_CLEARING_FLAGS:
828 /* We cleared the flags. */
829 if ((result < 0) || (len < 3) || (data[2] != 0)) {
830 /* Error clearing flags */
831 dev_warn(&ssif_info->client->dev,
832 "Error clearing flags: %d %d, %x\n",
833 result, len, (len >= 3) ? data[2] : 0);
834 } else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
835 || data[1] != IPMI_CLEAR_MSG_FLAGS_CMD) {
836 dev_warn(&ssif_info->client->dev,
837 "Invalid response clearing flags: %x %x\n",
838 data[0], data[1]);
839 }
840 ssif_info->ssif_state = SSIF_NORMAL;
841 ipmi_ssif_unlock_cond(ssif_info, flags);
842 break;
843
844 case SSIF_GETTING_EVENTS:
845 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
846 /* Error getting event, probably done. */
847 msg->done(msg);
848
849 /* Take off the event flag. */
850 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
851 handle_flags(ssif_info, flags);
852 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
853 || msg->rsp[1] != IPMI_READ_EVENT_MSG_BUFFER_CMD) {
854 dev_warn(&ssif_info->client->dev,
855 "Invalid response getting events: %x %x\n",
856 msg->rsp[0], msg->rsp[1]);
857 msg->done(msg);
858 /* Take off the event flag. */
859 ssif_info->msg_flags &= ~EVENT_MSG_BUFFER_FULL;
860 handle_flags(ssif_info, flags);
861 } else {
862 handle_flags(ssif_info, flags);
863 ssif_inc_stat(ssif_info, events);
864 deliver_recv_msg(ssif_info, msg);
865 }
866 break;
867
868 case SSIF_GETTING_MESSAGES:
869 if ((result < 0) || (len < 3) || (msg->rsp[2] != 0)) {
870 /* Error getting event, probably done. */
871 msg->done(msg);
872
873 /* Take off the msg flag. */
874 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
875 handle_flags(ssif_info, flags);
876 } else if (msg->rsp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
877 || msg->rsp[1] != IPMI_GET_MSG_CMD) {
878 dev_warn(&ssif_info->client->dev,
879 "Invalid response clearing flags: %x %x\n",
880 msg->rsp[0], msg->rsp[1]);
881 msg->done(msg);
882
883 /* Take off the msg flag. */
884 ssif_info->msg_flags &= ~RECEIVE_MSG_AVAIL;
885 handle_flags(ssif_info, flags);
886 } else {
887 ssif_inc_stat(ssif_info, incoming_messages);
888 handle_flags(ssif_info, flags);
889 deliver_recv_msg(ssif_info, msg);
890 }
891 break;
892 }
893
894 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
895 if (SSIF_IDLE(ssif_info) && !ssif_info->stopping) {
896 if (ssif_info->req_events)
897 start_event_fetch(ssif_info, flags);
898 else if (ssif_info->req_flags)
899 start_flag_fetch(ssif_info, flags);
900 else
901 start_next_msg(ssif_info, flags);
902 } else
903 ipmi_ssif_unlock_cond(ssif_info, flags);
904
905 if (ssif_info->ssif_debug & SSIF_DEBUG_STATE)
906 dev_dbg(&ssif_info->client->dev,
907 "DONE 2: state = %d.\n", ssif_info->ssif_state);
908 }
909
910 static void msg_written_handler(struct ssif_info *ssif_info, int result,
911 unsigned char *data, unsigned int len)
912 {
913 int rv;
914
915 /* We are single-threaded here, so no need for a lock. */
916 if (result < 0) {
917 ssif_info->retries_left--;
918 if (ssif_info->retries_left > 0) {
919 if (!start_resend(ssif_info)) {
920 ssif_inc_stat(ssif_info, send_retries);
921 return;
922 }
923 /* request failed, just return the error. */
924 ssif_inc_stat(ssif_info, send_errors);
925
926 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
927 dev_dbg(&ssif_info->client->dev,
928 "%s: Out of retries\n", __func__);
929 msg_done_handler(ssif_info, -EIO, NULL, 0);
930 return;
931 }
932
933 ssif_inc_stat(ssif_info, send_errors);
934
935 /*
936 * Got an error on transmit, let the done routine
937 * handle it.
938 */
939 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
940 dev_dbg(&ssif_info->client->dev,
941 "%s: Error %d\n", __func__, result);
942
943 msg_done_handler(ssif_info, result, NULL, 0);
944 return;
945 }
946
947 if (ssif_info->multi_data) {
948 /*
949 * In the middle of a multi-data write. See the comment
950 * in the SSIF_MULTI_n_PART case in the probe function
951 * for details on the intricacies of this.
952 */
953 int left, to_write;
954 unsigned char *data_to_send;
955 unsigned char cmd;
956
957 ssif_inc_stat(ssif_info, sent_messages_parts);
958
959 left = ssif_info->multi_len - ssif_info->multi_pos;
960 to_write = left;
961 if (to_write > 32)
962 to_write = 32;
963 /* Length byte. */
964 ssif_info->multi_data[ssif_info->multi_pos] = to_write;
965 data_to_send = ssif_info->multi_data + ssif_info->multi_pos;
966 ssif_info->multi_pos += to_write;
967 cmd = SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE;
968 if (ssif_info->cmd8_works) {
969 if (left == to_write) {
970 cmd = SSIF_IPMI_MULTI_PART_REQUEST_END;
971 ssif_info->multi_data = NULL;
972 }
973 } else if (to_write < 32) {
974 ssif_info->multi_data = NULL;
975 }
976
977 rv = ssif_i2c_send(ssif_info, msg_written_handler,
978 I2C_SMBUS_WRITE, cmd,
979 data_to_send, I2C_SMBUS_BLOCK_DATA);
980 if (rv < 0) {
981 /* request failed, just return the error. */
982 ssif_inc_stat(ssif_info, send_errors);
983
984 if (ssif_info->ssif_debug & SSIF_DEBUG_MSG)
985 dev_dbg(&ssif_info->client->dev,
986 "Error from i2c_non_blocking_op(3)\n");
987 msg_done_handler(ssif_info, -EIO, NULL, 0);
988 }
989 } else {
990 /* Ready to request the result. */
991 unsigned long oflags, *flags;
992
993 ssif_inc_stat(ssif_info, sent_messages);
994 ssif_inc_stat(ssif_info, sent_messages_parts);
995
996 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
997 if (ssif_info->got_alert) {
998 /* The result is already ready, just start it. */
999 ssif_info->got_alert = false;
1000 ipmi_ssif_unlock_cond(ssif_info, flags);
1001 start_get(ssif_info);
1002 } else {
1003 /* Wait a jiffie then request the next message */
1004 ssif_info->waiting_alert = true;
1005 ssif_info->retries_left = SSIF_RECV_RETRIES;
1006 ssif_info->rtc_us_timer = SSIF_MSG_PART_USEC;
1007 if (!ssif_info->stopping)
1008 mod_timer(&ssif_info->retry_timer,
1009 jiffies + SSIF_MSG_PART_JIFFIES);
1010 ipmi_ssif_unlock_cond(ssif_info, flags);
1011 }
1012 }
1013 }
1014
1015 static int start_resend(struct ssif_info *ssif_info)
1016 {
1017 int rv;
1018 int command;
1019
1020 ssif_info->got_alert = false;
1021
1022 if (ssif_info->data_len > 32) {
1023 command = SSIF_IPMI_MULTI_PART_REQUEST_START;
1024 ssif_info->multi_data = ssif_info->data;
1025 ssif_info->multi_len = ssif_info->data_len;
1026 /*
1027 * Subtle thing, this is 32, not 33, because we will
1028 * overwrite the thing at position 32 (which was just
1029 * transmitted) with the new length.
1030 */
1031 ssif_info->multi_pos = 32;
1032 ssif_info->data[0] = 32;
1033 } else {
1034 ssif_info->multi_data = NULL;
1035 command = SSIF_IPMI_REQUEST;
1036 ssif_info->data[0] = ssif_info->data_len;
1037 }
1038
1039 rv = ssif_i2c_send(ssif_info, msg_written_handler, I2C_SMBUS_WRITE,
1040 command, ssif_info->data, I2C_SMBUS_BLOCK_DATA);
1041 if (rv && (ssif_info->ssif_debug & SSIF_DEBUG_MSG))
1042 dev_dbg(&ssif_info->client->dev,
1043 "Error from i2c_non_blocking_op(4)\n");
1044 return rv;
1045 }
1046
1047 static int start_send(struct ssif_info *ssif_info,
1048 unsigned char *data,
1049 unsigned int len)
1050 {
1051 if (len > IPMI_MAX_MSG_LENGTH)
1052 return -E2BIG;
1053 if (len > ssif_info->max_xmit_msg_size)
1054 return -E2BIG;
1055
1056 ssif_info->retries_left = SSIF_SEND_RETRIES;
1057 memcpy(ssif_info->data + 1, data, len);
1058 ssif_info->data_len = len;
1059 return start_resend(ssif_info);
1060 }
1061
1062 /* Must be called with the message lock held. */
1063 static void start_next_msg(struct ssif_info *ssif_info, unsigned long *flags)
1064 {
1065 struct ipmi_smi_msg *msg;
1066 unsigned long oflags;
1067
1068 restart:
1069 if (!SSIF_IDLE(ssif_info)) {
1070 ipmi_ssif_unlock_cond(ssif_info, flags);
1071 return;
1072 }
1073
1074 if (!ssif_info->waiting_msg) {
1075 ssif_info->curr_msg = NULL;
1076 ipmi_ssif_unlock_cond(ssif_info, flags);
1077 } else {
1078 int rv;
1079
1080 ssif_info->curr_msg = ssif_info->waiting_msg;
1081 ssif_info->waiting_msg = NULL;
1082 ipmi_ssif_unlock_cond(ssif_info, flags);
1083 rv = start_send(ssif_info,
1084 ssif_info->curr_msg->data,
1085 ssif_info->curr_msg->data_size);
1086 if (rv) {
1087 msg = ssif_info->curr_msg;
1088 ssif_info->curr_msg = NULL;
1089 return_hosed_msg(ssif_info, msg);
1090 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1091 goto restart;
1092 }
1093 }
1094 }
1095
1096 static void sender(void *send_info,
1097 struct ipmi_smi_msg *msg)
1098 {
1099 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1100 unsigned long oflags, *flags;
1101
1102 BUG_ON(ssif_info->waiting_msg);
1103 ssif_info->waiting_msg = msg;
1104
1105 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1106 start_next_msg(ssif_info, flags);
1107
1108 if (ssif_info->ssif_debug & SSIF_DEBUG_TIMING) {
1109 struct timespec64 t;
1110
1111 ktime_get_real_ts64(&t);
1112 dev_dbg(&ssif_info->client->dev,
1113 "**Enqueue %02x %02x: %lld.%6.6ld\n",
1114 msg->data[0], msg->data[1],
1115 (long long)t.tv_sec, (long)t.tv_nsec / NSEC_PER_USEC);
1116 }
1117 }
1118
1119 static int get_smi_info(void *send_info, struct ipmi_smi_info *data)
1120 {
1121 struct ssif_info *ssif_info = send_info;
1122
1123 data->addr_src = ssif_info->addr_source;
1124 data->dev = &ssif_info->client->dev;
1125 data->addr_info = ssif_info->addr_info;
1126 get_device(data->dev);
1127
1128 return 0;
1129 }
1130
1131 /*
1132 * Upper layer wants us to request events.
1133 */
1134 static void request_events(void *send_info)
1135 {
1136 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1137 unsigned long oflags, *flags;
1138
1139 if (!ssif_info->has_event_buffer)
1140 return;
1141
1142 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1143 ssif_info->req_events = true;
1144 ipmi_ssif_unlock_cond(ssif_info, flags);
1145 }
1146
1147 /*
1148 * Upper layer is changing the flag saying whether we need to request
1149 * flags periodically or not.
1150 */
1151 static void ssif_set_need_watch(void *send_info, unsigned int watch_mask)
1152 {
1153 struct ssif_info *ssif_info = (struct ssif_info *) send_info;
1154 unsigned long oflags, *flags;
1155 long timeout = 0;
1156
1157 if (watch_mask & IPMI_WATCH_MASK_CHECK_MESSAGES)
1158 timeout = SSIF_WATCH_MSG_TIMEOUT;
1159 else if (watch_mask)
1160 timeout = SSIF_WATCH_WATCHDOG_TIMEOUT;
1161
1162 flags = ipmi_ssif_lock_cond(ssif_info, &oflags);
1163 if (timeout != ssif_info->watch_timeout) {
1164 ssif_info->watch_timeout = timeout;
1165 if (ssif_info->watch_timeout)
1166 mod_timer(&ssif_info->watch_timer,
1167 jiffies + ssif_info->watch_timeout);
1168 }
1169 ipmi_ssif_unlock_cond(ssif_info, flags);
1170 }
1171
1172 static int ssif_start_processing(void *send_info,
1173 struct ipmi_smi *intf)
1174 {
1175 struct ssif_info *ssif_info = send_info;
1176
1177 ssif_info->intf = intf;
1178
1179 return 0;
1180 }
1181
1182 #define MAX_SSIF_BMCS 4
1183
1184 static unsigned short addr[MAX_SSIF_BMCS];
1185 static int num_addrs;
1186 module_param_array(addr, ushort, &num_addrs, 0);
1187 MODULE_PARM_DESC(addr, "The addresses to scan for IPMI BMCs on the SSIFs.");
1188
1189 static char *adapter_name[MAX_SSIF_BMCS];
1190 static int num_adapter_names;
1191 module_param_array(adapter_name, charp, &num_adapter_names, 0);
1192 MODULE_PARM_DESC(adapter_name, "The string name of the I2C device that has the BMC. By default all devices are scanned.");
1193
1194 static int slave_addrs[MAX_SSIF_BMCS];
1195 static int num_slave_addrs;
1196 module_param_array(slave_addrs, int, &num_slave_addrs, 0);
1197 MODULE_PARM_DESC(slave_addrs,
1198 "The default IPMB slave address for the controller.");
1199
1200 static bool alerts_broken;
1201 module_param(alerts_broken, bool, 0);
1202 MODULE_PARM_DESC(alerts_broken, "Don't enable alerts for the controller.");
1203
1204 /*
1205 * Bit 0 enables message debugging, bit 1 enables state debugging, and
1206 * bit 2 enables timing debugging. This is an array indexed by
1207 * interface number"
1208 */
1209 static int dbg[MAX_SSIF_BMCS];
1210 static int num_dbg;
1211 module_param_array(dbg, int, &num_dbg, 0);
1212 MODULE_PARM_DESC(dbg, "Turn on debugging.");
1213
1214 static bool ssif_dbg_probe;
1215 module_param_named(dbg_probe, ssif_dbg_probe, bool, 0);
1216 MODULE_PARM_DESC(dbg_probe, "Enable debugging of probing of adapters.");
1217
1218 static bool ssif_tryacpi = true;
1219 module_param_named(tryacpi, ssif_tryacpi, bool, 0);
1220 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the default scan of the interfaces identified via ACPI");
1221
1222 static bool ssif_trydmi = true;
1223 module_param_named(trydmi, ssif_trydmi, bool, 0);
1224 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the default scan of the interfaces identified via DMI (SMBIOS)");
1225
1226 static DEFINE_MUTEX(ssif_infos_mutex);
1227 static LIST_HEAD(ssif_infos);
1228
1229 #define IPMI_SSIF_ATTR(name) \
1230 static ssize_t ipmi_##name##_show(struct device *dev, \
1231 struct device_attribute *attr, \
1232 char *buf) \
1233 { \
1234 struct ssif_info *ssif_info = dev_get_drvdata(dev); \
1235 \
1236 return snprintf(buf, 10, "%u\n", ssif_get_stat(ssif_info, name));\
1237 } \
1238 static DEVICE_ATTR(name, S_IRUGO, ipmi_##name##_show, NULL)
1239
1240 static ssize_t ipmi_type_show(struct device *dev,
1241 struct device_attribute *attr,
1242 char *buf)
1243 {
1244 return snprintf(buf, 10, "ssif\n");
1245 }
1246 static DEVICE_ATTR(type, S_IRUGO, ipmi_type_show, NULL);
1247
1248 IPMI_SSIF_ATTR(sent_messages);
1249 IPMI_SSIF_ATTR(sent_messages_parts);
1250 IPMI_SSIF_ATTR(send_retries);
1251 IPMI_SSIF_ATTR(send_errors);
1252 IPMI_SSIF_ATTR(received_messages);
1253 IPMI_SSIF_ATTR(received_message_parts);
1254 IPMI_SSIF_ATTR(receive_retries);
1255 IPMI_SSIF_ATTR(receive_errors);
1256 IPMI_SSIF_ATTR(flag_fetches);
1257 IPMI_SSIF_ATTR(hosed);
1258 IPMI_SSIF_ATTR(events);
1259 IPMI_SSIF_ATTR(watchdog_pretimeouts);
1260 IPMI_SSIF_ATTR(alerts);
1261
1262 static struct attribute *ipmi_ssif_dev_attrs[] = {
1263 &dev_attr_type.attr,
1264 &dev_attr_sent_messages.attr,
1265 &dev_attr_sent_messages_parts.attr,
1266 &dev_attr_send_retries.attr,
1267 &dev_attr_send_errors.attr,
1268 &dev_attr_received_messages.attr,
1269 &dev_attr_received_message_parts.attr,
1270 &dev_attr_receive_retries.attr,
1271 &dev_attr_receive_errors.attr,
1272 &dev_attr_flag_fetches.attr,
1273 &dev_attr_hosed.attr,
1274 &dev_attr_events.attr,
1275 &dev_attr_watchdog_pretimeouts.attr,
1276 &dev_attr_alerts.attr,
1277 NULL
1278 };
1279
1280 static const struct attribute_group ipmi_ssif_dev_attr_group = {
1281 .attrs = ipmi_ssif_dev_attrs,
1282 };
1283
1284 static void shutdown_ssif(void *send_info)
1285 {
1286 struct ssif_info *ssif_info = send_info;
1287
1288 device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
1289 dev_set_drvdata(&ssif_info->client->dev, NULL);
1290
1291 /* make sure the driver is not looking for flags any more. */
1292 while (ssif_info->ssif_state != SSIF_NORMAL)
1293 schedule_timeout(1);
1294
1295 ssif_info->stopping = true;
1296 del_timer_sync(&ssif_info->watch_timer);
1297 del_timer_sync(&ssif_info->retry_timer);
1298 if (ssif_info->thread) {
1299 complete(&ssif_info->wake_thread);
1300 kthread_stop(ssif_info->thread);
1301 }
1302 }
1303
1304 static int ssif_remove(struct i2c_client *client)
1305 {
1306 struct ssif_info *ssif_info = i2c_get_clientdata(client);
1307 struct ssif_addr_info *addr_info;
1308
1309 if (!ssif_info)
1310 return 0;
1311
1312 /*
1313 * After this point, we won't deliver anything asychronously
1314 * to the message handler. We can unregister ourself.
1315 */
1316 ipmi_unregister_smi(ssif_info->intf);
1317
1318 list_for_each_entry(addr_info, &ssif_infos, link) {
1319 if (addr_info->client == client) {
1320 addr_info->client = NULL;
1321 break;
1322 }
1323 }
1324
1325 kfree(ssif_info);
1326
1327 return 0;
1328 }
1329
1330 static int read_response(struct i2c_client *client, unsigned char *resp)
1331 {
1332 int ret = -ENODEV, retry_cnt = SSIF_RECV_RETRIES;
1333
1334 while (retry_cnt > 0) {
1335 ret = i2c_smbus_read_block_data(client, SSIF_IPMI_RESPONSE,
1336 resp);
1337 if (ret > 0)
1338 break;
1339 msleep(SSIF_MSG_MSEC);
1340 retry_cnt--;
1341 if (retry_cnt <= 0)
1342 break;
1343 }
1344
1345 return ret;
1346 }
1347
1348 static int do_cmd(struct i2c_client *client, int len, unsigned char *msg,
1349 int *resp_len, unsigned char *resp)
1350 {
1351 int retry_cnt;
1352 int ret;
1353
1354 retry_cnt = SSIF_SEND_RETRIES;
1355 retry1:
1356 ret = i2c_smbus_write_block_data(client, SSIF_IPMI_REQUEST, len, msg);
1357 if (ret) {
1358 retry_cnt--;
1359 if (retry_cnt > 0)
1360 goto retry1;
1361 return -ENODEV;
1362 }
1363
1364 ret = read_response(client, resp);
1365 if (ret > 0) {
1366 /* Validate that the response is correct. */
1367 if (ret < 3 ||
1368 (resp[0] != (msg[0] | (1 << 2))) ||
1369 (resp[1] != msg[1]))
1370 ret = -EINVAL;
1371 else if (ret > IPMI_MAX_MSG_LENGTH) {
1372 ret = -E2BIG;
1373 } else {
1374 *resp_len = ret;
1375 ret = 0;
1376 }
1377 }
1378
1379 return ret;
1380 }
1381
1382 static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
1383 {
1384 unsigned char *resp;
1385 unsigned char msg[3];
1386 int rv;
1387 int len;
1388
1389 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1390 if (!resp)
1391 return -ENOMEM;
1392
1393 /* Do a Get Device ID command, since it is required. */
1394 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1395 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1396 rv = do_cmd(client, 2, msg, &len, resp);
1397 if (rv)
1398 rv = -ENODEV;
1399 else
1400 strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
1401 kfree(resp);
1402 return rv;
1403 }
1404
1405 static int strcmp_nospace(char *s1, char *s2)
1406 {
1407 while (*s1 && *s2) {
1408 while (isspace(*s1))
1409 s1++;
1410 while (isspace(*s2))
1411 s2++;
1412 if (*s1 > *s2)
1413 return 1;
1414 if (*s1 < *s2)
1415 return -1;
1416 s1++;
1417 s2++;
1418 }
1419 return 0;
1420 }
1421
1422 static struct ssif_addr_info *ssif_info_find(unsigned short addr,
1423 char *adapter_name,
1424 bool match_null_name)
1425 {
1426 struct ssif_addr_info *info, *found = NULL;
1427
1428 restart:
1429 list_for_each_entry(info, &ssif_infos, link) {
1430 if (info->binfo.addr == addr) {
1431 if (info->adapter_name || adapter_name) {
1432 if (!info->adapter_name != !adapter_name) {
1433 /* One is NULL and one is not */
1434 continue;
1435 }
1436 if (adapter_name &&
1437 strcmp_nospace(info->adapter_name,
1438 adapter_name))
1439 /* Names do not match */
1440 continue;
1441 }
1442 found = info;
1443 break;
1444 }
1445 }
1446
1447 if (!found && match_null_name) {
1448 /* Try to get an exact match first, then try with a NULL name */
1449 adapter_name = NULL;
1450 match_null_name = false;
1451 goto restart;
1452 }
1453
1454 return found;
1455 }
1456
1457 static bool check_acpi(struct ssif_info *ssif_info, struct device *dev)
1458 {
1459 #ifdef CONFIG_ACPI
1460 acpi_handle acpi_handle;
1461
1462 acpi_handle = ACPI_HANDLE(dev);
1463 if (acpi_handle) {
1464 ssif_info->addr_source = SI_ACPI;
1465 ssif_info->addr_info.acpi_info.acpi_handle = acpi_handle;
1466 return true;
1467 }
1468 #endif
1469 return false;
1470 }
1471
1472 static int find_slave_address(struct i2c_client *client, int slave_addr)
1473 {
1474 #ifdef CONFIG_IPMI_DMI_DECODE
1475 if (!slave_addr)
1476 slave_addr = ipmi_dmi_get_slave_addr(
1477 SI_TYPE_INVALID,
1478 i2c_adapter_id(client->adapter),
1479 client->addr);
1480 #endif
1481
1482 return slave_addr;
1483 }
1484
1485 static int start_multipart_test(struct i2c_client *client,
1486 unsigned char *msg, bool do_middle)
1487 {
1488 int retry_cnt = SSIF_SEND_RETRIES, ret;
1489
1490 retry_write:
1491 ret = i2c_smbus_write_block_data(client,
1492 SSIF_IPMI_MULTI_PART_REQUEST_START,
1493 32, msg);
1494 if (ret) {
1495 retry_cnt--;
1496 if (retry_cnt > 0)
1497 goto retry_write;
1498 dev_err(&client->dev, "Could not write multi-part start, though the BMC said it could handle it. Just limit sends to one part.\n");
1499 return ret;
1500 }
1501
1502 if (!do_middle)
1503 return 0;
1504
1505 ret = i2c_smbus_write_block_data(client,
1506 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
1507 32, msg + 32);
1508 if (ret) {
1509 dev_err(&client->dev, "Could not write multi-part middle, though the BMC said it could handle it. Just limit sends to one part.\n");
1510 return ret;
1511 }
1512
1513 return 0;
1514 }
1515
1516 static void test_multipart_messages(struct i2c_client *client,
1517 struct ssif_info *ssif_info,
1518 unsigned char *resp)
1519 {
1520 unsigned char msg[65];
1521 int ret;
1522 bool do_middle;
1523
1524 if (ssif_info->max_xmit_msg_size <= 32)
1525 return;
1526
1527 do_middle = ssif_info->max_xmit_msg_size > 63;
1528
1529 memset(msg, 0, sizeof(msg));
1530 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1531 msg[1] = IPMI_GET_DEVICE_ID_CMD;
1532
1533 /*
1534 * The specification is all messed up dealing with sending
1535 * multi-part messages. Per what the specification says, it
1536 * is impossible to send a message that is a multiple of 32
1537 * bytes, except for 32 itself. It talks about a "start"
1538 * transaction (cmd=6) that must be 32 bytes, "middle"
1539 * transaction (cmd=7) that must be 32 bytes, and an "end"
1540 * transaction. The "end" transaction is shown as cmd=7 in
1541 * the text, but if that's the case there is no way to
1542 * differentiate between a middle and end part except the
1543 * length being less than 32. But there is a table at the far
1544 * end of the section (that I had never noticed until someone
1545 * pointed it out to me) that mentions it as cmd=8.
1546 *
1547 * After some thought, I think the example is wrong and the
1548 * end transaction should be cmd=8. But some systems don't
1549 * implement cmd=8, they use a zero-length end transaction,
1550 * even though that violates the SMBus specification.
1551 *
1552 * So, to work around this, this code tests if cmd=8 works.
1553 * If it does, then we use that. If not, it tests zero-
1554 * byte end transactions. If that works, good. If not,
1555 * we only allow 63-byte transactions max.
1556 */
1557
1558 ret = start_multipart_test(client, msg, do_middle);
1559 if (ret)
1560 goto out_no_multi_part;
1561
1562 ret = i2c_smbus_write_block_data(client,
1563 SSIF_IPMI_MULTI_PART_REQUEST_END,
1564 1, msg + 64);
1565
1566 if (!ret)
1567 ret = read_response(client, resp);
1568
1569 if (ret > 0) {
1570 /* End transactions work, we are good. */
1571 ssif_info->cmd8_works = true;
1572 return;
1573 }
1574
1575 ret = start_multipart_test(client, msg, do_middle);
1576 if (ret) {
1577 dev_err(&client->dev, "Second multipart test failed.\n");
1578 goto out_no_multi_part;
1579 }
1580
1581 ret = i2c_smbus_write_block_data(client,
1582 SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
1583 0, msg + 64);
1584 if (!ret)
1585 ret = read_response(client, resp);
1586 if (ret > 0)
1587 /* Zero-size end parts work, use those. */
1588 return;
1589
1590 /* Limit to 63 bytes and use a short middle command to mark the end. */
1591 if (ssif_info->max_xmit_msg_size > 63)
1592 ssif_info->max_xmit_msg_size = 63;
1593 return;
1594
1595 out_no_multi_part:
1596 ssif_info->max_xmit_msg_size = 32;
1597 return;
1598 }
1599
1600 /*
1601 * Global enables we care about.
1602 */
1603 #define GLOBAL_ENABLES_MASK (IPMI_BMC_EVT_MSG_BUFF | IPMI_BMC_RCV_MSG_INTR | \
1604 IPMI_BMC_EVT_MSG_INTR)
1605
1606 static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
1607 {
1608 unsigned char msg[3];
1609 unsigned char *resp;
1610 struct ssif_info *ssif_info;
1611 int rv = 0;
1612 int len;
1613 int i;
1614 u8 slave_addr = 0;
1615 struct ssif_addr_info *addr_info = NULL;
1616
1617 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
1618 if (!resp)
1619 return -ENOMEM;
1620
1621 ssif_info = kzalloc(sizeof(*ssif_info), GFP_KERNEL);
1622 if (!ssif_info) {
1623 kfree(resp);
1624 return -ENOMEM;
1625 }
1626
1627 if (!check_acpi(ssif_info, &client->dev)) {
1628 addr_info = ssif_info_find(client->addr, client->adapter->name,
1629 true);
1630 if (!addr_info) {
1631 /* Must have come in through sysfs. */
1632 ssif_info->addr_source = SI_HOTMOD;
1633 } else {
1634 ssif_info->addr_source = addr_info->addr_src;
1635 ssif_info->ssif_debug = addr_info->debug;
1636 ssif_info->addr_info = addr_info->addr_info;
1637 addr_info->client = client;
1638 slave_addr = addr_info->slave_addr;
1639 }
1640 }
1641
1642 slave_addr = find_slave_address(client, slave_addr);
1643
1644 dev_info(&client->dev,
1645 "Trying %s-specified SSIF interface at i2c address 0x%x, adapter %s, slave address 0x%x\n",
1646 ipmi_addr_src_to_str(ssif_info->addr_source),
1647 client->addr, client->adapter->name, slave_addr);
1648
1649 ssif_info->client = client;
1650 i2c_set_clientdata(client, ssif_info);
1651
1652 /* Now check for system interface capabilities */
1653 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1654 msg[1] = IPMI_GET_SYSTEM_INTERFACE_CAPABILITIES_CMD;
1655 msg[2] = 0; /* SSIF */
1656 rv = do_cmd(client, 3, msg, &len, resp);
1657 if (!rv && (len >= 3) && (resp[2] == 0)) {
1658 if (len < 7) {
1659 if (ssif_dbg_probe)
1660 dev_dbg(&ssif_info->client->dev,
1661 "SSIF info too short: %d\n", len);
1662 goto no_support;
1663 }
1664
1665 /* Got a good SSIF response, handle it. */
1666 ssif_info->max_xmit_msg_size = resp[5];
1667 ssif_info->max_recv_msg_size = resp[6];
1668 ssif_info->multi_support = (resp[4] >> 6) & 0x3;
1669 ssif_info->supports_pec = (resp[4] >> 3) & 0x1;
1670
1671 /* Sanitize the data */
1672 switch (ssif_info->multi_support) {
1673 case SSIF_NO_MULTI:
1674 if (ssif_info->max_xmit_msg_size > 32)
1675 ssif_info->max_xmit_msg_size = 32;
1676 if (ssif_info->max_recv_msg_size > 32)
1677 ssif_info->max_recv_msg_size = 32;
1678 break;
1679
1680 case SSIF_MULTI_2_PART:
1681 if (ssif_info->max_xmit_msg_size > 63)
1682 ssif_info->max_xmit_msg_size = 63;
1683 if (ssif_info->max_recv_msg_size > 62)
1684 ssif_info->max_recv_msg_size = 62;
1685 break;
1686
1687 case SSIF_MULTI_n_PART:
1688 /* We take whatever size given, but do some testing. */
1689 break;
1690
1691 default:
1692 /* Data is not sane, just give up. */
1693 goto no_support;
1694 }
1695 } else {
1696 no_support:
1697 /* Assume no multi-part or PEC support */
1698 dev_info(&ssif_info->client->dev,
1699 "Error fetching SSIF: %d %d %2.2x, your system probably doesn't support this command so using defaults\n",
1700 rv, len, resp[2]);
1701
1702 ssif_info->max_xmit_msg_size = 32;
1703 ssif_info->max_recv_msg_size = 32;
1704 ssif_info->multi_support = SSIF_NO_MULTI;
1705 ssif_info->supports_pec = 0;
1706 }
1707
1708 test_multipart_messages(client, ssif_info, resp);
1709
1710 /* Make sure the NMI timeout is cleared. */
1711 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1712 msg[1] = IPMI_CLEAR_MSG_FLAGS_CMD;
1713 msg[2] = WDT_PRE_TIMEOUT_INT;
1714 rv = do_cmd(client, 3, msg, &len, resp);
1715 if (rv || (len < 3) || (resp[2] != 0))
1716 dev_warn(&ssif_info->client->dev,
1717 "Unable to clear message flags: %d %d %2.2x\n",
1718 rv, len, resp[2]);
1719
1720 /* Attempt to enable the event buffer. */
1721 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1722 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
1723 rv = do_cmd(client, 2, msg, &len, resp);
1724 if (rv || (len < 4) || (resp[2] != 0)) {
1725 dev_warn(&ssif_info->client->dev,
1726 "Error getting global enables: %d %d %2.2x\n",
1727 rv, len, resp[2]);
1728 rv = 0; /* Not fatal */
1729 goto found;
1730 }
1731
1732 ssif_info->global_enables = resp[3];
1733
1734 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF) {
1735 ssif_info->has_event_buffer = true;
1736 /* buffer is already enabled, nothing to do. */
1737 goto found;
1738 }
1739
1740 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1741 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1742 msg[2] = ssif_info->global_enables | IPMI_BMC_EVT_MSG_BUFF;
1743 rv = do_cmd(client, 3, msg, &len, resp);
1744 if (rv || (len < 2)) {
1745 dev_warn(&ssif_info->client->dev,
1746 "Error setting global enables: %d %d %2.2x\n",
1747 rv, len, resp[2]);
1748 rv = 0; /* Not fatal */
1749 goto found;
1750 }
1751
1752 if (resp[2] == 0) {
1753 /* A successful return means the event buffer is supported. */
1754 ssif_info->has_event_buffer = true;
1755 ssif_info->global_enables |= IPMI_BMC_EVT_MSG_BUFF;
1756 }
1757
1758 /* Some systems don't behave well if you enable alerts. */
1759 if (alerts_broken)
1760 goto found;
1761
1762 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
1763 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
1764 msg[2] = ssif_info->global_enables | IPMI_BMC_RCV_MSG_INTR;
1765 rv = do_cmd(client, 3, msg, &len, resp);
1766 if (rv || (len < 2)) {
1767 dev_warn(&ssif_info->client->dev,
1768 "Error setting global enables: %d %d %2.2x\n",
1769 rv, len, resp[2]);
1770 rv = 0; /* Not fatal */
1771 goto found;
1772 }
1773
1774 if (resp[2] == 0) {
1775 /* A successful return means the alert is supported. */
1776 ssif_info->supports_alert = true;
1777 ssif_info->global_enables |= IPMI_BMC_RCV_MSG_INTR;
1778 }
1779
1780 found:
1781 if (ssif_dbg_probe) {
1782 dev_dbg(&ssif_info->client->dev,
1783 "%s: i2c_probe found device at i2c address %x\n",
1784 __func__, client->addr);
1785 }
1786
1787 spin_lock_init(&ssif_info->lock);
1788 ssif_info->ssif_state = SSIF_NORMAL;
1789 timer_setup(&ssif_info->retry_timer, retry_timeout, 0);
1790 timer_setup(&ssif_info->watch_timer, watch_timeout, 0);
1791
1792 for (i = 0; i < SSIF_NUM_STATS; i++)
1793 atomic_set(&ssif_info->stats[i], 0);
1794
1795 if (ssif_info->supports_pec)
1796 ssif_info->client->flags |= I2C_CLIENT_PEC;
1797
1798 ssif_info->handlers.owner = THIS_MODULE;
1799 ssif_info->handlers.start_processing = ssif_start_processing;
1800 ssif_info->handlers.shutdown = shutdown_ssif;
1801 ssif_info->handlers.get_smi_info = get_smi_info;
1802 ssif_info->handlers.sender = sender;
1803 ssif_info->handlers.request_events = request_events;
1804 ssif_info->handlers.set_need_watch = ssif_set_need_watch;
1805
1806 {
1807 unsigned int thread_num;
1808
1809 thread_num = ((i2c_adapter_id(ssif_info->client->adapter)
1810 << 8) |
1811 ssif_info->client->addr);
1812 init_completion(&ssif_info->wake_thread);
1813 ssif_info->thread = kthread_run(ipmi_ssif_thread, ssif_info,
1814 "kssif%4.4x", thread_num);
1815 if (IS_ERR(ssif_info->thread)) {
1816 rv = PTR_ERR(ssif_info->thread);
1817 dev_notice(&ssif_info->client->dev,
1818 "Could not start kernel thread: error %d\n",
1819 rv);
1820 goto out;
1821 }
1822 }
1823
1824 dev_set_drvdata(&ssif_info->client->dev, ssif_info);
1825 rv = device_add_group(&ssif_info->client->dev,
1826 &ipmi_ssif_dev_attr_group);
1827 if (rv) {
1828 dev_err(&ssif_info->client->dev,
1829 "Unable to add device attributes: error %d\n",
1830 rv);
1831 goto out;
1832 }
1833
1834 rv = ipmi_register_smi(&ssif_info->handlers,
1835 ssif_info,
1836 &ssif_info->client->dev,
1837 slave_addr);
1838 if (rv) {
1839 dev_err(&ssif_info->client->dev,
1840 "Unable to register device: error %d\n", rv);
1841 goto out_remove_attr;
1842 }
1843
1844 out:
1845 if (rv) {
1846 if (addr_info)
1847 addr_info->client = NULL;
1848
1849 dev_err(&ssif_info->client->dev,
1850 "Unable to start IPMI SSIF: %d\n", rv);
1851 kfree(ssif_info);
1852 }
1853 kfree(resp);
1854 return rv;
1855
1856 out_remove_attr:
1857 device_remove_group(&ssif_info->client->dev, &ipmi_ssif_dev_attr_group);
1858 dev_set_drvdata(&ssif_info->client->dev, NULL);
1859 goto out;
1860 }
1861
1862 static int ssif_adapter_handler(struct device *adev, void *opaque)
1863 {
1864 struct ssif_addr_info *addr_info = opaque;
1865
1866 if (adev->type != &i2c_adapter_type)
1867 return 0;
1868
1869 addr_info->added_client = i2c_new_device(to_i2c_adapter(adev),
1870 &addr_info->binfo);
1871
1872 if (!addr_info->adapter_name)
1873 return 1; /* Only try the first I2C adapter by default. */
1874 return 0;
1875 }
1876
1877 static int new_ssif_client(int addr, char *adapter_name,
1878 int debug, int slave_addr,
1879 enum ipmi_addr_src addr_src,
1880 struct device *dev)
1881 {
1882 struct ssif_addr_info *addr_info;
1883 int rv = 0;
1884
1885 mutex_lock(&ssif_infos_mutex);
1886 if (ssif_info_find(addr, adapter_name, false)) {
1887 rv = -EEXIST;
1888 goto out_unlock;
1889 }
1890
1891 addr_info = kzalloc(sizeof(*addr_info), GFP_KERNEL);
1892 if (!addr_info) {
1893 rv = -ENOMEM;
1894 goto out_unlock;
1895 }
1896
1897 if (adapter_name) {
1898 addr_info->adapter_name = kstrdup(adapter_name, GFP_KERNEL);
1899 if (!addr_info->adapter_name) {
1900 kfree(addr_info);
1901 rv = -ENOMEM;
1902 goto out_unlock;
1903 }
1904 }
1905
1906 strncpy(addr_info->binfo.type, DEVICE_NAME,
1907 sizeof(addr_info->binfo.type));
1908 addr_info->binfo.addr = addr;
1909 addr_info->binfo.platform_data = addr_info;
1910 addr_info->debug = debug;
1911 addr_info->slave_addr = slave_addr;
1912 addr_info->addr_src = addr_src;
1913 addr_info->dev = dev;
1914
1915 if (dev)
1916 dev_set_drvdata(dev, addr_info);
1917
1918 list_add_tail(&addr_info->link, &ssif_infos);
1919
1920 if (initialized)
1921 i2c_for_each_dev(addr_info, ssif_adapter_handler);
1922 /* Otherwise address list will get it */
1923
1924 out_unlock:
1925 mutex_unlock(&ssif_infos_mutex);
1926 return rv;
1927 }
1928
1929 static void free_ssif_clients(void)
1930 {
1931 struct ssif_addr_info *info, *tmp;
1932
1933 mutex_lock(&ssif_infos_mutex);
1934 list_for_each_entry_safe(info, tmp, &ssif_infos, link) {
1935 list_del(&info->link);
1936 kfree(info->adapter_name);
1937 kfree(info);
1938 }
1939 mutex_unlock(&ssif_infos_mutex);
1940 }
1941
1942 static unsigned short *ssif_address_list(void)
1943 {
1944 struct ssif_addr_info *info;
1945 unsigned int count = 0, i = 0;
1946 unsigned short *address_list;
1947
1948 list_for_each_entry(info, &ssif_infos, link)
1949 count++;
1950
1951 address_list = kcalloc(count + 1, sizeof(*address_list),
1952 GFP_KERNEL);
1953 if (!address_list)
1954 return NULL;
1955
1956 list_for_each_entry(info, &ssif_infos, link) {
1957 unsigned short addr = info->binfo.addr;
1958 int j;
1959
1960 for (j = 0; j < i; j++) {
1961 if (address_list[j] == addr)
1962 /* Found a dup. */
1963 break;
1964 }
1965 if (j == i) /* Didn't find it in the list. */
1966 address_list[i++] = addr;
1967 }
1968 address_list[i] = I2C_CLIENT_END;
1969
1970 return address_list;
1971 }
1972
1973 #ifdef CONFIG_ACPI
1974 static const struct acpi_device_id ssif_acpi_match[] = {
1975 { "IPI0001", 0 },
1976 { },
1977 };
1978 MODULE_DEVICE_TABLE(acpi, ssif_acpi_match);
1979 #endif
1980
1981 #ifdef CONFIG_DMI
1982 static int dmi_ipmi_probe(struct platform_device *pdev)
1983 {
1984 u8 slave_addr = 0;
1985 u16 i2c_addr;
1986 int rv;
1987
1988 if (!ssif_trydmi)
1989 return -ENODEV;
1990
1991 rv = device_property_read_u16(&pdev->dev, "i2c-addr", &i2c_addr);
1992 if (rv) {
1993 dev_warn(&pdev->dev, "No i2c-addr property\n");
1994 return -ENODEV;
1995 }
1996
1997 rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr);
1998 if (rv)
1999 slave_addr = 0x20;
2000
2001 return new_ssif_client(i2c_addr, NULL, 0,
2002 slave_addr, SI_SMBIOS, &pdev->dev);
2003 }
2004 #else
2005 static int dmi_ipmi_probe(struct platform_device *pdev)
2006 {
2007 return -ENODEV;
2008 }
2009 #endif
2010
2011 static const struct i2c_device_id ssif_id[] = {
2012 { DEVICE_NAME, 0 },
2013 { }
2014 };
2015 MODULE_DEVICE_TABLE(i2c, ssif_id);
2016
2017 static struct i2c_driver ssif_i2c_driver = {
2018 .class = I2C_CLASS_HWMON,
2019 .driver = {
2020 .name = DEVICE_NAME
2021 },
2022 .probe = ssif_probe,
2023 .remove = ssif_remove,
2024 .alert = ssif_alert,
2025 .id_table = ssif_id,
2026 .detect = ssif_detect
2027 };
2028
2029 static int ssif_platform_probe(struct platform_device *dev)
2030 {
2031 return dmi_ipmi_probe(dev);
2032 }
2033
2034 static int ssif_platform_remove(struct platform_device *dev)
2035 {
2036 struct ssif_addr_info *addr_info = dev_get_drvdata(&dev->dev);
2037
2038 if (!addr_info)
2039 return 0;
2040
2041 mutex_lock(&ssif_infos_mutex);
2042 i2c_unregister_device(addr_info->added_client);
2043
2044 list_del(&addr_info->link);
2045 kfree(addr_info);
2046 mutex_unlock(&ssif_infos_mutex);
2047 return 0;
2048 }
2049
2050 static const struct platform_device_id ssif_plat_ids[] = {
2051 { "dmi-ipmi-ssif", 0 },
2052 { }
2053 };
2054
2055 static struct platform_driver ipmi_driver = {
2056 .driver = {
2057 .name = DEVICE_NAME,
2058 },
2059 .probe = ssif_platform_probe,
2060 .remove = ssif_platform_remove,
2061 .id_table = ssif_plat_ids
2062 };
2063
2064 static int init_ipmi_ssif(void)
2065 {
2066 int i;
2067 int rv;
2068
2069 if (initialized)
2070 return 0;
2071
2072 pr_info("IPMI SSIF Interface driver\n");
2073
2074 /* build list for i2c from addr list */
2075 for (i = 0; i < num_addrs; i++) {
2076 rv = new_ssif_client(addr[i], adapter_name[i],
2077 dbg[i], slave_addrs[i],
2078 SI_HARDCODED, NULL);
2079 if (rv)
2080 pr_err("Couldn't add hardcoded device at addr 0x%x\n",
2081 addr[i]);
2082 }
2083
2084 if (ssif_tryacpi)
2085 ssif_i2c_driver.driver.acpi_match_table =
2086 ACPI_PTR(ssif_acpi_match);
2087
2088 if (ssif_trydmi) {
2089 rv = platform_driver_register(&ipmi_driver);
2090 if (rv)
2091 pr_err("Unable to register driver: %d\n", rv);
2092 else
2093 platform_registered = true;
2094 }
2095
2096 ssif_i2c_driver.address_list = ssif_address_list();
2097
2098 rv = i2c_add_driver(&ssif_i2c_driver);
2099 if (!rv)
2100 initialized = true;
2101
2102 return rv;
2103 }
2104 module_init(init_ipmi_ssif);
2105
2106 static void cleanup_ipmi_ssif(void)
2107 {
2108 if (!initialized)
2109 return;
2110
2111 initialized = false;
2112
2113 i2c_del_driver(&ssif_i2c_driver);
2114
2115 kfree(ssif_i2c_driver.address_list);
2116
2117 if (ssif_trydmi && platform_registered)
2118 platform_driver_unregister(&ipmi_driver);
2119
2120 free_ssif_clients();
2121 }
2122 module_exit(cleanup_ipmi_ssif);
2123
2124 MODULE_ALIAS("platform:dmi-ipmi-ssif");
2125 MODULE_AUTHOR("Todd C Davis <todd.c.davis@intel.com>, Corey Minyard <minyard@acm.org>");
2126 MODULE_DESCRIPTION("IPMI driver for management controllers on a SMBus");
2127 MODULE_LICENSE("GPL");
Linux with added FPC-III support